Contoured core for toroidal yokes

ABSTRACT

A deflection yoke for a cathode ray tube includes a core member having at least one inwardly protruding ridge member and winding of wires toroidally wrapped about the core member and including a flux altering means in the form of a winding gap centrally disposed about the ridge member.

United States Patent 91 Torsch CONTOURED CORE FOR TOROIDAL YOKES [75] Inventor: Charles Edward Torsch, Emporium,

[7 3] Assignee: GTE Sylvania Incorporated, Seneca Falls,N.Y.

[22] Filed: Jan. 25, 1971' [21] Appl.No.: 109,378

[52] US. Cl ..335/2l0, 335/213 [51] Int. Cl ..H01f 7/00 [58] Field of Search ..335/2l0, 213;

[56] References Cited UNITED STATES PATENTS 3,652,966 3/1972 Meier ..335/2l0 [451 Apr; 17, 1973 5/1967 Obert ..335/2l3 4/1966 Torsch ..335/2l3X FOREIGN PATENTS OR APPLICATIONS Japan ..335/21O Netherlands ..335/210 Primary Examiner-George Harris Att0rney-Norman J. O'Malley, Robert E. Walrath and Thomas H. Buffton [57] ABSTRACT A deflection yoke for a cathode ray tube includes a core member having at least one inwardly protruding ridge member and winding of wires toroidally wrapped about the core member and including a flux altering means in the form of a winding gap centrally disposed about the ridge member.

10 Claims, 4 Drawing Figures pmgmgmmmma 3.728.653

' INVENQTOR. CHARLES E. TORSCH ATTORNEY CONTOURED CORE FOR TOROIDAL YOKES CROSS-REFERENCE TO RELATED APPLICATIONS Co-pending US. application entitled Combined Deflection Yoke and Housing having Ser. No. 851,300 and filed Aug. 19, 1969 in the name ofCharles Edward Torsch relates to a toroid-wound yoke struc ture. Also, a co-pending application entitled Deflection System for Triad Beam Cathode Ray Tube having Ser. No. 841,893 and filed July 15, I969 in the name of Charles Edward Torsch relates to a toroid-wound deflection yoke and system.

BACKGROUND OF THE INVENTION The prior art suggests toroidal-wound deflection yokes for cathode ray tubes wherein a core member has a relatively large diameter and a relatively small diameter core end. The core member has a relatively large diameter plastic crown affixed to the relatively large diameter core end and a relatively small diameter plastic crown affixed to the relatively small diameter core end. These plastic crowns are inter-connected by a shield member which surrounds the core member and one or more wire windings are toroidally wrapped about the core member, shield member and relatively large and small diameter plastic crowns.

Ordinarily, the plastic crowns include ear and tab members for supporting the core member while the toroidal turns of wire are applied. Also, each of the one or more toroidal windings includes a flux altering means in the form of a winding gap which is usually aligned with the ear and tab members. Moreover, the windings frequently are of a multiple-layer type whereupon tensional winding pressure of a second layer is applied as lateral pressure upon a first layer of turns which tends to cause undesired lateral movement of the wires of the first layer of turns into the abovementioned winding gap.

Previous attempts to alleviate undesired movement of the wire turns into the winding gap include the halting of the winding process, application of a glue to the wires and core member, waiting for the glue to dry, and resumption of the winding process. Obviously, such a procedure is unduly time consuming which, in turn, is expensive and inefficient.

OBJECTS AND SUMMARY OF THE INVENTION An object of the present invention is to provide an enhanced core member for a toroidal-wound deflection yoke for use with a cathode ray tube. Another object of the invention is to provide an improved toroidal-wound deflection yoke for a cathode ray tube system. Still another object of the invention is to provide an enhanced flux altering means for a toroidal-wound deflection yoke. A further object of the invention is to provide improved alignment of a core member and a plastic crown member to enhance attachment of toroidal-wound wires and formation of an improved flux altering means in a deflection yoke.

These and other objects, advantages and capabilities are achieved in one aspect of the invention by a toroidal-wound deflection yoke having a core member with a circular neck-like portion, flared portion, and curved portion interconnecting the neck-like and flared portions and at least one ridge member protruding inwardly from the curved portion of the core member. At least one winding is toroidally wrapped about the core member and includes a flux altering means in the form of a winding gap centrally disposed with respect to the ridge member.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded isometric view of a preferred embodiment of the invention;

FIG. 2 is a sectional elevational view taken along the lines 2-2 of FIG. 1;

FIG. 3 is a sectional view taken along the lines 3-3 of FIG. 2; and

FIG. 4 is a front elevational view of a deflection yoke illustrating the features of a preferred embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENT For a better understanding of the present invention, together with other and further objects, advantages and capabilities thereof, reference is made to the following disclosure and appended claims in connection with the accompanying drawings.

Referring to FIG. 1 of the drawings, a deflection yoke for a cathode ray tube to effect horizontal and vertical deflection of a plurality of electron beams includes a core member 5 of a magnetic material having a relatively high permeability factor such as one hundred or more, for instance. The core member 5 is usually encased by a plastic shield member 7 having an integral plastic crown 9 of relatively small diameter and a relatively large diameter plastic crown 11 formed for attachment to the shield member 7.

The relatively small diameter plastic crown 9 integral to the shield member 7 includes a plurality of tab members l3 and a plurality of wire receiving slots 15. Similarly, the relatively large diameter plastic crown 11 includes a plurality of wire receiving slots 15 and a plurality of forward and outward extending ear members 17. Also, the relatively large diameter plastic crown 11 includes a plurality of hook-like members 19 formed for locking engagement with a plurality of slots 21 of the plastic shield member 7.

Further, the core member 5 has a relatively large diameter core end 23 with at least one index groove 25 therein. Also, the relatively large diameter plastic crown member 11 includes at least one detent 27 formed to mate with the index groove 25 of the core end 23. In this manner, alignment of the core member 5, the shield member 7, integral plastic crown 9, and large diameter plastic crown 11 is achieved.

Also, FIG. 2 illustrates a cross-sectional view of the core member 5 as taken along the line 2-2. Therein,

the core member 5 has a neck-like portion 29 formed for cooperative engagement with the neck of a cathode ray tube, a flared portion 31 formed to conform to the funnel-like portion of a cathode ray tube, and a curved portion 33 interconnecting the neck-like and flare portions 29 and 31.

Additionally, at least one ridge member 35 extends inwardly from and longitudinally along the curved portion 33 of the core member 5. As can be seen in the cross-sectional view of FIG. 3, taken along the lines 3- 3 of FIG. 2, the ridge member 35 is preferably, not

necessarily, integral to the core member 5 and has a relatively smooth rounded surface.

As shown in FIG. 4, a winding of wire turns 37 is toroidally wrapped about the core member 5 covered by the shield member 7 with affixed plastic crowns 9 and 11 respectively. The winding of wire turns 37 includes a flux altering means in the form ofa winding gap 39 substantially centrally disposed with respect to the ear member 17. Moreover, the ridge member 35 (as illustrated) is aligned with the ear member 17 and centrally disposed with respect to the winding gap 39. Thus, the ridge member 35 serves to maintain the desired circumferential dimension of the winding gap 39 by restricting the positional location of the wire turns 37 insofar as a circumferential distribution is concerned.

Moreover, a preferred embodiment includes a deflection yoke having a horizontal axis H-H' and a vertical axis V-V', FIG. 4, with a pair of ridge members 35 disposed in diametric opposition to one another on each of the horizontal and vertical axes. A pair of horizontal deflection windings are oppositely disposed about the vertical axis V-V' with each including a winding gap 39 centered with respect to a ridge member 35. A pair of vertical deflection windings are oppositely disposed about the horizontal axis HH with each including a winding gap centered with respect to a ridge member 35.

Thus, the ridge members serve to maintain a desired circumferential location of winding wires adjacent thereto. Also, the ridge members facilitate the provision of a flux altering means in the form of a winding gap. Moreover, the index groove of the core member and the detent of the plastic crown enhance alignment of the ridge members and ear members. In this manner,

the winding gap is centrally disposed about the ridge member and positional location of the wires is maintained thereby. Moreover, the maintenance of the positional location of wires is even more effective when multiple-layer windings are employed.

Thus, there has been provided a unique deflection yoke for use with a cathode ray tube. The yoke includes a ridge member which greatly enhances manufacturing capabilities at reduced cost of both time and labor. Moreover, undesired circumferential movement of winding wires is eliminated or at least greatly reduced tending to enhance uniformity and consistency of the resulting structures.

While there has been shown and described what is at present considered the preferred embodiments of the invention, it will be obvious to those skilled in the art that various changes and modifications may be made therein without departing from the invention as defined by the appended claims.

lclaim:

l. A deflection yoke for a cathode ray tube comprising:

a core member having a neck-like portion encircling and extending along a longitudinal axis, a flared portion encircling and extending along and outwardly from said longitudinal axis, and a curved portion interconnecting said neck-like and flared portions and encircling said longitudinal axis;

a ridge member protruding inwardly from said curved portion of said core member toward said longitudinal axis and extending therealong; and

a winding of wires toroidally wrapped about said core member and having at least one flux altering means in the form of a winding gap centrally disposed with respect to said ridge member whereby said ridge member serves to maintain the positional location of the wires of said winding forming said winding gap.

2. The deflection yoke of claim 1 wherein said core member includes a horizontal and a vertical axis, said ridge member is disposed on one of said axes and said winding gap of said winding is centrally disposed with respect to said ridge member and said axis.

3. The deflection yoke of claim 1 wherein said core member includes a horizontal and a vertical axis, a pair of ridge members disposed on each of said horizontal and vertical axes and extending inwardly from diametrically opposed curved portions of said core member, and a pair of horizontal and a pair of vertical toroidal windings each having a winding gap centrally disposed with respect to one of said ridge members.

4. The deflection yoke of claim 1 wherein said flared portion of said core member includes a large diameter core end, at least one index groove molded into said core end, and a plastic crown having at least one detent formed for mating with said core end index groove and affixed thereto by said toroidal windings.

5. The deflection yoke of claim 1 wherein said flared portion of said core member includes a large diameter core end, said core end includes a plurality of index grooves, a plastic crown having a plurality of detents formed for mating with said index grooves and a plurality of outwardly extending ear members each aligned with a ridge member, and a plurality of windings to roidally wrapped about said core and plastic crown and having a winding gap aligned with each of said ridge members.

6. A deflection yoke for a cathode ray tube comprising:

a core member having a neck-like portion, a flared portion ending in a large diameter core end, and a curved portion interconnecting said neck-like and flared portions, said core end having at least one index groove;

a plastic crown having at least one ear member extending outwardly therefrom and a detent formed for alignment with said index groove, said crown being formed for mating with said core end of said core member;

a ridge member protruding inwardly from said curved portion of said core member and aligned with said ear member of said plastic crown; and

a wire winding toroidally wrapped about said plastic crown and said core member and having a flux altering means in the form of a winding gap centrally aligned with said ridge member whereby said ridge member maintains the positional location of said wires of said winding forming said winding gap.

7. The deflection yoke of claim 6 wherein said wire winding toroidally wrapped about said plastic crown includes a flux altering means in the form of a winding gap adjacent to said ridge member.

8. The deflection yoke of claim 6 wherein said core member includes a horizontal axis and a vertical axis, a pair of ridge members disposed in diametric opposition on each of said horizontal and vertical axes, a plastic member extends inwardly from said curved portion and is integral thereto.

10. The combination of claim 6 wherein said wire winding is in the form of multiple wire layers. 

1. A deflection yoke for a cathode ray tube comprising: a core member having a neck-like portion encircling and extending along a longitudinal axis, a flared portion encircling and extending along and outwardly from said longitudinal axis, and a curved portion interconnecting said neck-like and flared portions and encircling said longitudinal axis; a ridge member protruding inwardly from said curved portion of said core member toward said longitudinal axis and extending therealong; and a winding of wires toroidally wrapped about said core member and having at least one flux altering means in the form of a winding gap centrally disposed with respect to said ridge member whereby said ridge member serves to maintain the positional location of the wires of said winding forming said winding gap.
 2. The deflection yoke of claim 1 wherein said core member includes a horizontal and a vertical axis, said ridge member is disposed on one of said axes and said winding gap of said winding is centrally disposed with respect to said ridge member and said axis.
 3. The deflection yoke of claim 1 wherein said core member includes a horizontal and a vertical axis, a pair of ridge members disposed on each of said horizontal and vertical axes and extending inwardly from diametrically opposed curved portions of said core member, and a pair of horizontal and a pair of vertical toroidal windings each having a winding gap centrally disposed with respect to one of said ridge members.
 4. The deflection yoke of claim 1 wherein said flared portion of said core member includes a large diameter core end, at least one index groove molded into said core end, and a plastic crown having at least one detent formed for mating with said core end index groove and affixed thereto by said toroidal windings.
 5. The deflection yoke of claim 1 wherein said flared portion of said core member includes a large diameter core end, said core end includes a plurality of index grooves, a plastic crown having a plurality of detents formed for mating with said index grooves and a plurality of outwardly extending ear members each aligned with a ridge member, and a plurality of windings toroidally wrapped abOut said core and plastic crown and having a winding gap aligned with each of said ridge members.
 6. A deflection yoke for a cathode ray tube comprising: a core member having a neck-like portion, a flared portion ending in a large diameter core end, and a curved portion interconnecting said neck-like and flared portions, said core end having at least one index groove; a plastic crown having at least one ear member extending outwardly therefrom and a detent formed for alignment with said index groove, said crown being formed for mating with said core end of said core member; a ridge member protruding inwardly from said curved portion of said core member and aligned with said ear member of said plastic crown; and a wire winding toroidally wrapped about said plastic crown and said core member and having a flux altering means in the form of a winding gap centrally aligned with said ridge member whereby said ridge member maintains the positional location of said wires of said winding forming said winding gap.
 7. The deflection yoke of claim 6 wherein said wire winding toroidally wrapped about said plastic crown includes a flux altering means in the form of a winding gap adjacent to said ridge member.
 8. The deflection yoke of claim 6 wherein said core member includes a horizontal axis and a vertical axis, a pair of ridge members disposed in diametric opposition on each of said horizontal and vertical axes, a plastic crown having an ear member aligned with each one of said ridge members, and a plurality of windings toroidally wrapped about said core member and plastic crown with a flux altering means in the form of a winding gap centrally disposed about each ridge member.
 9. The combination of claim 6 wherein said ridge member extends inwardly from said curved portion and is integral thereto.
 10. The combination of claim 6 wherein said wire winding is in the form of multiple wire layers. 